Simulation study of beam distribution and secondary neutron for intermediate energy proton single event effect test

Abstract

BackgroundBased on the 100 MeV proton cyclotron in the China Institute of Atomic Energy (CIAE), the middle-energy proton irradiation test facility was established and several proton single event effect (SEE) experimental study of micro-and nano-electronic devices were carried out. The proton beam striking the device under test (DUT) is contaminated with neutrons generated as a result of protons interacting with the devices between the accelerator and the DUT. The quality of the proton beam directly affects the effectiveness and accuracy of the experimental cross section of proton SEE.PurposeThis study aims to simulate the proton beam distribution and secondary neutron for intermediate energy proton SEE test.MethodsFirst of all, the geometric model of the proton beam transmission line was established. Then, the Monte Carlo N Particle Transport Code (MCNP) was employed to simulate the proton beam of 100 MeV incidence energy. Results were reduced to the case of single proton incidence, the energy and fluence distribution of proton beams on the sample irradiation plane were obtained, as well as the energy and fluence distribution of the secondary neutrons. Finally, influence of secondary neutrons on the experimental cross section of proton single event effect was analyzed according to the ratio of neutron fluence to proton fluence.Results & ConclusionsSimulation results show the effect of secondary neutrons on the cross section of proton single event effect is insignificant, and the medium energy proton irradiation test facility in CIAE is very suitable for the experimental study of proton single event effects.

Keywords

• single event effect
• proton radiation test
• secondary neutron